Belt-stretching machine



(No Modl.)

B. M. PLUMMER. BELT STRETGHING MACHINE.

PatentedJ 11 4 mef/ UNITED STATES PATENT. OFFICE.

BENJAMIN M. PLUMMER, OF PHILADELPHIA, PENNSYLVANIA.

BELT-STRETCHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 355,472, dated January 4, 1887.

Y Application filed Marcil 7, 1885. Serial No. 158,035. (No model.)

. lowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. v

In the manufacture of belts for machinery from duck or canvas it is necessary to subjectthc same to great strain for a considerable length of time to take out all the stretch7 there is in the material, and for this purpose various expedients have been resorted to with more or less satisfactory effects. These belts being 110W made of long or continuous lengths and it being desirable to stretch them uniformly through their entire length at the same time, it has been a problem how to accomplish this within a reasonable space and with the single application o f power.

My invention has forits object the provision of means for avoiding previous difliculties and for providing a simple and convenient apparatus for uniformly stretching throughout their entire length belts of any length or width; and to this end it consists in the combination, in a frame or structure, of aseries of parallel shafts and a plurality of loose pulleys upon each of the shafts, and in other specitic combinations, which will be hereinafter particularly described, and specifically pointed out in the claims.

In the drawing, the igure is a perspective View of my apparatus.

A A are standards or posts well braced and supported in the ground, in a building, or other suitable frame-work. These post-s are placed in pairs Ysome distance apart and form supports for a plurality of parallel shafts. On each of these shafts are hung a plurality of pulleys, b, having equal diameters, and held far enough apart to prevent their edges from .grinding their hubs.

through the hub to the. shaft.

shafts vand any number of e pulleys on each of such shafts may be used, and that by such. arrangement a very long belt, or a plurality of belts, or a very wide belt may be stretched with equal facility.

The manner of stretching the beltby my apparatus is as follows: Secure one end in any convenient manner and pass or wind the belt over the pulleys in the manner shown, then exert a strain on the belt by windlass, block and tackle, or other means of multiplying power, and then secure the same and let it stand.

Additional strains should be applied from time totime for a number of days to entirely accomplish the desired results. t

To apply additional strain to the belt, weights may be placed across the belt between the rollers. r

By the multiplication of loose pulleys on the shafts I am enabled on the same frame or apparatus to stretch an extremely long belt or a number of narrow belts at the 'same time, while being also able to stretch a very wide belt with the same facility as would be the case if the shafts were provided with a single pulley extending from end to end. f

The pulley-bearings are oiled through a passage ruiming from the face of the pulleys The passage is provided witha screw-plug to prevent the oil from leakingout onto the belts.

Having now described my invention. I claiml. The combination, in a frame or structure,- of a plurality of parallel shafts and a plurality of loose pulleys upon each of said shafts, substantially as and for the purpose set forth.

2.- The combination, with a series of parallel shafts, each provided with a plurality of loo/se pulleys of equal diameter, of means for exerting atension or strain on a belt when the belt is appliedto or mounted on the shafts and pulleys, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

BENJAMIN M. PLUMMER.

Witnesses:

J. B. JARDELLA, A. G; MURPHEY. 

